Naman Chauhan
For this project, the type of keypad we will use is a matrix keypad. This is a keypad that follows an encoding scheme that allows it to have much less output pins than there are keys. For example, the matrix keypad we are using has 16 keys (0-9, A-D, *, #), yet only 8 output pins. With a linear keypad, there would have to be 17 output pins (one for each key and a ground pin) in order to work. The matrix encoding scheme allows for less output pins and thus much less connections that have to be made for the keypad to work. In this way, they are more efficient than linear keypads, being that they have less wiring.
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Using 4×4 Keypad With Arduino
Keypads are used in all types of devices, including cell phones, fax machines, microwaves, ovens, door locks, etc.
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